@p @nigger @bonkers All GPL versions can be revoked in you don't follow the terms - GPLv2 automatically terminates on violation even.

The license on that old version cannot be revoked provided you follow the terms (oh wait, it usually already has been automatically is revoked if you've ever distributed a lot of GPLv2-only software, as what do you think the proprietary software inserted into Linux for example is for? It wouldn't surprise me if proprietary derivative works were included in plan 9).

In the case that the copyright holder(s) hold all relevant GPLv2-only copyrights, they can choose to release a later version under different license that isn't GPLv2-only.